Emergence of a new pair-coherent phase in many-body quenches of repulsive bosons

Details Emergence of a new pair-coherent phase in many-body quenches of repulsive bosons Emergence of a new pair-coherent phase in many-body quenches of repulsive bosons

2010-11-30

arxiv.org/abs/1011.6444v2

Phys. Rev. A 84, 011604(R) (2011)

Physics

Condensed Matter

Quantum Gases

4 pages of RevTex4-1, 4 figures; Rapid Communication in Physical Review A

Scientific paper

10.1103/PhysRevA.84.011604

We investigate the dynamical mode population statistics and associated first- and second-order coherence of an interacting bosonic two-mode model when the pair-exchange coupling is quenched from negative to positive values. It is shown that for moderately rapid second-order transitions, a new pair-coherent phase emerges on the positive coupling side in an excited state, which is not fragmented as the ground-state single-particle density matrix would prescribe it to be.

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